Arphthicarus trivestigius, Niedbała, 2012

Niedbała, W., 2012, An Updated Study Of Ptyctimous Mite Fauna (Acari: Oribatida) Of The Australasian Region With A Description Of Thirteen New Species, Acarologia 52 (2), pp. 183-228 : 201

Arphthicarus trivestigius n. sp.

( Figure 6 A-F)

Material examined — Holotype and 37 paratypes (19 in ANIC, 18 in NHC): ANIC- 357, 12 km South of Ravenshoe, 1000 m, rainforest, 17°43’S 145°30’E, 3 July 1971, coll. R. W. Taylor and J. Feehan.

Measurements of holotype — Prodorsum: length 318, width 212, height 96, sensillum 53, setae: interlamellar 126, rostral 61; notogaster: length 540, width 399, height 394, c 1 169, c 2 101, cp 94, h 1 177, p 1 164, c 1 / c 1 - d 1 = 1.2; genitoaggenital plate 215 × 119, anoadanal plate 190 × 101.

Description — Colour brown light. Cuticle well sculptured with weak concavities.

Prodorsum with sigillar fields not very distinct but narrow. Lateral carinae absent. Sensilla with long, narrow pedicel enlarged towards distal end with indistinct rough head. Interlamellar setae erect, strong, thick covered sparsely by barbs, similar to notogastral setae, lamellar and exobothridial setae vestigial, rostral setae erect, spiniform, rough.

Notogaster with 15 pairs of very thick, spiniform setae covered sparsely by barbs, median setae longer than lateral ones. Setae c 1 and c 3 remote from anterior border, setae c 2 far from border. Vestigial setae f 1 posteriorly of h 1 setae. Four pairs of lyrifissures ia, im, ip and ips present.

Ventral region — Setae h of mentum considerably longer than distance between them. Genitoaggenital plates with nine pairs of genital setae with arrangement: 4+1: 4. Aggenital setae long. Anoadanal plates each with five setae, anal setae smallest, adanal setae ad 2 situated near anal setae, setae ad 3 vestigial.

Legs — Formulae of setae and solenidia of complete type. Setae d of femora I forked distally and remote from distal end of article.

Etymology — The name of species alludes to the three different vestigial setae: lamellar, exobothridial and adanal setae ad 3.

Comparison to related species — The new species is distinguishable by the presence of three pairs of setae vestigial: lamellar, exobothridial and adanal setae ad 3, while its sensilla are long and narrow, enlarged towards distal end, median setae of notogaster longer than ventral setae, short anal setae and position of adanal setae ad 2 near anal setae.

Figures

FIGURE 6: Arphthicarus trivestigius n. sp. (holotype): A – prodorsum, dorsal view, B – prodorsum, lateral view, C – lateral view of opisthosoma, D – mentum of infracapitulum, E – genitoaggenital and anoadanal plates, F – trochanter and femur I.